Telephone system.



11. Pf GLAUSBN. TELEPHONE SYSTEM. APPLAIGATION FILED APILZS. 1901.

Paneaqune 6,1911.

45 i i' source offcurrent, the said coils being adapti PATENT OFFICE;

HENRY# `1?, 'CLAUSEM or CHICAGO,

ILLINOIS, ASSIGNOR, Y MESNE ASSIGNMENTS, 'ITO "'"srRoMBERG-CARLSCN TELEPHONE MANUFACTURING COMPANY, or. noomisrism$` YoRK, A1 CoRPoRArIoN or NEW YORK. v v

Be. it known that-L f-HENnY P. 'CLAUsEN,`

' ful Improvement in I Telephone Syst-ems, ofy

whichtlie following is a'specication.' l My invention relates to improvements in telephone systems, and has special reference to'those systemsA employing a common call-v ingA generator at they central statlon and a grounded bell at l' the' subscribers stations, w-itlrprovision [als`0` for connecting the lines of suchasysteni Withvother'lines employing c a `magneto,.callingset,and a series or y bridgbellat 'the` subscribersstations, as in the ordinary'toll'line.

The invention has for its object-s the provision of a common generator 'signaling system" of telephony, having grounded signaling bells at the subscribers st-ations and without repeating coils at the central station or l other complicated 'apparatusgof means Jfor utilizingthe samecord-circuits, for .connecting'suchf'lines withfot-her lines having diii'e'rent methods ofgsi'gnaling, or grounded lines, such as toll l'iries,by conveniently in troducingrepeating coils 'into the cord circuits`,"an"d of a` vsimple and 'efiicient arrangement 'of apparatus and circuits whereby a bettcrand more economical serviceis obtainedyg' f l y To these .ends and suchiothers as may hereinafter appear, the invention comprises a centraloiiice,from which subscribers lines radiate, the usual-arrangement of the subscribers apparatus lbeing employed except that oneline conductor ot' the metallic circuit is grounded" through lthe subscribe'rs hook, restingfcontact, and signaling bell. At central the cord circuits have their strands eachA connectedwith the tip and sleeve contacts of the plugs, with a double coil relay connected'thereacross and having its, centerjpoint connected with the central 'ed t` operate*supervisory signals for the leoi'ivenience of the opera-ton A switch is al's'o provided* to cut [1n a repeating coil 1n they cord circuit forv usein connection with having the line springs 11 and l2 which are TELEPHONE sysrnivi,

Srecication 0f Letters ,Patent Patented June-6,41911. Application filed April 2G, `1901. Serial No. 57,531. f I

toll or other lines differing from the main system.

'The invention further consists in the arrangements, connections, and combinations hereinafter described, and particularly pointed out in the claims, reference being had to the accompanying drawings forming a part hereof, in which the same reference characters designate like parts throughout the severalviews and in Which- Figure 1 is a diagrammatic viewof one embodiment of my invention; Fig. 2 is a simple diagrammatic view showinglines of different type connected together.' ,y

`In theseiigures, A and B denote the subscribers stations, which are each provided with the usual. apparatus, including transmitters 2, local A'battery 3, induction coil 4, receiver 5, hook switch 6 connected .with one of the` line wires, and the signal bell 7, grounded from the normal or resting contact of the hook switch. The lines comprise the conductors 8 and 9, which terminate in' the central otlice in the line spring jacks 10,

normally connected through, their. resting contacts with the branch conductors leading to the line annunciatorl 13, and common bat-'- tery 14, the'type of annunciator used being preferably of the self-restoring type indicated conventionally, and the generatorl'al being-preferably a storage battery, though' `other sources of current could be substituted' The operators connective means comprise the cord circuits having the plugs 15 and 1G to which the cord-strands 17 and 18 are con. nected, each strand extending between the tip of Vone plug and the sleeve ring of the other. 4The usual listening andr ringingI key is provided, by virtue of which the opera-r tors; telephone maybe connected with the cord-circuit by springs 19, and the'ringing generator by the springs 20, these devices not being shown for the sake of clearness'but only indicated bythe adjacent contact. 95

4Across the cord circuitl between the strands 17 and 18 the double coil rela 22 is bridged or connected, having the coi s 23 and common armature 24, which controls the opera.

tion of the local clrcuit containing the super- 101.

vis ry lamp 25 and battery 26, which may 1 be the same as battery 14.

In the operation of so much ofthe system as described, the subscriber at A lifts his ]ack and the ringing key-springs 2O operated visory signal 25 will operate in the saine way tolthrow ringing current upon the line.` This generator being grounded at central, the ringing current passes from ground thereat over one line conductor to ground at the subscribers station through his grounded bell. When the plug 1.5 alone is in the jack the supervisory lamp is not lighted, for the telephone at the subscribers station A is 0H the hook and the ground branch is cut off.

y But when the plug 1G is inserted in the jack of the called subscriber the lamp is lighted by the action of relay 22 over a circuit from ground at central, through the. battery 14, conductor 27, coil 23 of the relay, strand 17 of the cord circuit, line Wire 9 to and through the ground branch containing the bell at substation B. But when the subscriber responds the ground is cut olf and the lamp extinguished. Then the conversation is terminated and either party hangs up his receiver, the lamp aga-in lights to indicate the fact to the operator. Either coil 23 is capable of closing the armature whereby either subscriber is capable of actuating it over the grounded line conductor and the proper cord strand.

The main object in connecting the tip and sleeve contacts of the plugs with each strand of t-lie cord circuit is so that both coils of the1 relay 22 may be used to operate the armature 24, in which case the grounded -conductors of the subscribers lines should be connected in the same unvarying relation with the jack springs.

ment is not absolutely necessary conductors can be grounded if desired or and the' cord strands also conas it happens, y

so far as some features nected in any Way, l of my invention are concerned. The superfor the line.

under these conditions but one relay may be used more than the other.

In such a system as described it is often found desirable or essential to connect lines of another type therewith as, for example, lines using the ordinary magneto generator and accompanying apparatus for signaling, or grounded lines. Such occasion might also arise in thc case of toll lines, or where all the lines lof the local exchange didnot conform to the general system abovev outlined.

But this arrange-v fone type of lines, for dividing the connective means into 1n- Such a dierent line is indicated at the left in Fig. '1, and has the station C provided with subscribers station apparatus as usual, including the magneto generator 430. Line wires 31 and 32 extend to the central otlice and there connect with the jack 33 and line signal 4. In order to connect the other lines A of the main system with this or other type of line Without providing an entirely different cord-circuit from that heretofore used and described, I provide a repeating coil 35 normally disconnected from the cord strands, but adapted to be inserted therein by the switch 36, indicated conventionall ,and having the conductin portions 3 and 38 adapted to norma ly complete the cord strands '17 and 18, but having also the insulatin portions 3Ta and 38a adapted to break t em and connect the windings of the repeating coil 35 thereacross by `means of the springs 39 and Lt0. A clearing-out drop -50 is bridged across the calling side of said repeating coil, while the other clearing iut relay 22 would remain connected with the other end of the cord circuit, as indicated in Fig. 2. This switching-in of the repeating coil renders the cord-circuit eonductively discontinuous and changes it over into inductively'continuous sections, as ind'aated simply in Fig. 2 where the repeating coil is shown inductively connecting the different types of lines.

By this arrangement a system is provided having all the advantages of automatic common battery signaling and supervision, with the further advantage of a complete through talking circuit devoid of obstructions such as relays or repeating coils therein, and a further ready means for instantly rendering the circuit conductively discontinuous to connect together lines of difterent types.

The repeating coil of course may be used with any operators connective means and is not limited so far as its general features are concerned to one with that shown.

The invention is'held to include all such changes, alterations, and modifications as fairly fall within the scope and principle. It is defined in the following claims:

1. In a telephone system, the combination with a central oliice, subscribers lines of one type terminating ,thereat, other lines of a dilferent type also terminating at said office, operators connective means to variously connect said lines versational purposes, a common source of current, a double coil relay bridged across the said connective means and having au armature for said coils, a supervisory signal controlled by said armature, the middle point of said coils being connected with said source `of current, the said means -forming a through talking and repeating coil means together for con-v circuit when used Awith.

meeting,,linesof rv both ,types togetherl said y disconnectedufrm'on'e ed'of Said conne-,f

tlv ncansy ,when thegnepeatingoil use, a spe whenjthe4 introduced,

said relaycoi 'a sicientirnpedance to cause the voice currentstol traverse one winding off, th *n ggcoilfland the said connective iniieain's being; adapted to transpose the two sides of the talking'cirf. cuit-1...

...mi n i 2. In a telephone system, the combination" with subscribers lines, of a central oltice at which said lines terminate, a common source of current supply thereat connected with the lines, operators connective means to connect said lines together for conversational purposes, a double coil .relay bridged across the said connective means and having an armature forsaid coils, a supervisory signal controlled by said armature, the middle point of said coils being connected with the said 'source of current supply, other lines terminatingat the central otlice and not connected with the common battery supply, and repeating coils to be introduced in the said connective means when lines of the one set` are to be connected with lines of the other setsaid coils and common source of current being disconnected from one end of said 'connective meanswhen `the repeating coil is in use, a special disconnect signal for the cord when the repeating coils are introduced,l said relay coils having a suliicient impedance to cause the voice currents to travcrse one winding of the repeating coil,vand

' the saidconnective means being adapted to transpose the two sides of the talking circuit.

3. In a telcphonelsystem, the combination with subscribers metallic lines, of a central oflice at which said lines terminate, a cordcilrcuit connective means thereat to connect 'said metallic lines together in pairs to form through talking circuits, a common source of current, a double coil relay bridged acrossl the said connective means and having an armature for aid coils, a supervisory signal controlled by said armature, the middle point of said coils being connected with the said common source of current, oth'er lines terminating atl said central otce, repeating coils, and keys to insert said coils in said, cord-circuits when it is desired to` connect the metallic lines with the other lines said coils and comlnon source of current being disconnected from one end of said connec- 'tive means when the rcpeating.coil is in use, a special disconnect signal for the cord when the repeating coils are introduced, said relay coils having a sufficient impedance to cause. the voice currents to traverseone windmg of the repeating coil, and the said posethe two `ides of thetalking circuit.

111' i telephones/ists *,lines'. fof aS -ingf'purpojses, a; com on so Sarraf.-. .s A the said 'connective' means and: ha'vlng an' ...armatu-refor sald colls, a supervisory signal connective means being adapted to trans' controlledby` ,saidv armature, l the middle e' said common source of current supply, said means being -conductively continuous for use in connection with lines of one type, and means including a repeating coil for making them inductively continuous but conductively discontinuous ywhen used to connect the Ilines of one set with those of the other said coils and common source of current being disconnected from one end of said con? nective means when the repeating coil is in use, aspecial disconnect signal for the cord when the repeating coils are introduced, said -relay coils having a sufficient impedance to cause the voice currents to traverse one winding of the repeating coil, and the said connective means being adapted'to transps the tivo sides' of the talking circuit.

5. In a telephone system, the combination -with a central oice, subscribers lines of one typeterminating thereat, other lines -of a different type also terminating at the said office, operators connective means /to variously connect said lines together for talking purposes, a common source of current supply, a double coil relay bridged across the said connective means and having an. armature for said coils, a supervisory signal controlled by said armature, the middle point of said coils being connected with the said common source of current supply, said means forming a through talking ircnit when used with the lines of one set, and a repeating coil introduced into said means when it is desired to connect lines of onev type with those of the other said coils and comlnon source of current ybeing disconnected. from one end of said connective means when the repeating coil is in use, a* special disconnect signal for the cord when the repeating coils are introduced, said relay l coils having a sufficient impedance to cause the voice currents to traverse one winding of the repeating coil, and the said connective means being adapted to transpose the 'two sides of the talking circuit.

6. In a telephone system, the combination .middle pointconnected to ground through a battery, and a repeating coil adapted to -be used as an' inductive connection when it becomes necessary to connect a Subscribers i ypoint or:4 said" coils being connectedlwith ith" of a' double-coil supervisory relay vhaving its line of one type with a subscribers line of a the said connective means being adapted to iu diier'ent type said coils and common source transpose the two ,sides of the 'talking c1rof current being disconnected from one end cuit.

of said connective means when the repeating Signed by me at Chicago, Cook county; coil is in use, a' special disconnect signal for Illinois, this 24th d of April 1901.v

the cord when the repeating coils are intro- HE RY I. CJAUSEN. n duced, said relay coils having a' suicient in1- Witnesses z' pedance to cause the voice currents to trav- L. A. GARDINER,-

erse one winding of the repeatingcoil, and HARRY P. BAUMGARTNER,

'Copies of this patent may be obtained for ve cents each, Sy addressing the Commissioner of Patents.

Washington, III).v 

